Many models of reduced complexity have been theorized to predict energy dissipation due to micro-slip in mechanical joints, including Iwan models. This class of reduced-order models is is based on a spring element combined with a frictional slider, known as a Jenkin’s element. Critical for their use, Jenkin’s elements have been shown to satisfy Masing’s hypothesis, which builds a full hysteresis loop from only a monotonic backbone curve. This paper will show that an edge effect, derived from the height of the joint geometry being analyzed, precludes realistic joint geometries from following the Masing hypothesis. A brief derivation of Iwan models and their association to Masing’s hypothesis is presented. A closed-form, 1-D continuum model is presented to establish a baseline for joint behavior without explicit height effect. To show the edge effect that joint height introduce, a finite element model was analyzed. It is shown that as the joint member height increases, the more prevalent the edge effect is, and the more quickly energy dissipation falls away from the power-law relationship predicted by 1-D models.

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